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        <h1><a href="../../index.html">All files</a> / <a href="index.html">src/utils</a> h.ts</h1>
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interface Attrs {
  [key: string]: any;
  style?: { [key: string]: any };
  dataset?: { [key: string]: any };
  classList?: string[];
  onclick?(e: MouseEvent): void;
  oncontextmenu?(e: MouseEvent): void;
  onmouseenter?(e: MouseEvent): void;
}
type ChildElements = (HTMLElement | undefined | null | string)[];
/**
 * createElement function
 * h(tag[, text[,children]])
 * h(tag[, attrs[,children]])
 * h(tag[, children])
 * @param tag tag name ,support `tag#id.class` emmet grammar，only support id ,class
 * @param attrs Object - attribute，string - textContent，Array - children。children auto ignore falsy value
 * @param children
 */
export default function h(tag: string, attrs?: Attrs | string | number | ChildElements, children?: ChildElements): HTMLElement {
  // TODO: validate param type
  const tagMatch = tag.match(/^[\w\d]+/);
  if (!tagMatch) <span class="branch-0 cbranch-no" title="branch not covered" >throw new Error('invalid tag');</span>
  const tagStr = tagMatch[0];
&nbsp;
  // parse emmet grammar (support id class)
  const id = tag.match(/#[\w\d_-]+/);
  // let classArr = tag.match(/(?&lt;=\.)[\w\d_-]+/g) || []; // className // low level browser not support
  let classArr: string[] = tag.match(/\.[\w\d_-]+/g) || []; // className
  classArr = Array.from(classArr).map(it =&gt; it.substring(1));
&nbsp;
  const elem: any = document.createElement(tagStr);
  if (id) elem.id = id[0].substring(1);
&nbsp;
  if (Array.isArray(attrs)) {
    children = attrs;
  } else if (typeof attrs === 'object' &amp;&amp; attrs !== null) {
    for (const attr in attrs) {
      if (attr === 'style' || attr === 'dataset') {
        // if (attr === 'style' &amp;&amp; 'cssText' in attrs.style) {
        //   elem.style.cssText = attrs.style.cssText;
        // }
        const v = attrs[attr];
        for (const key in v) {
          // if (attr === 'style' &amp;&amp; key === 'cssText') continue;
          elem[attr][key] = v[key];
        }
      } else if (attr === 'classList' &amp;&amp; Array.isArray(attrs.classList)) {
        classArr = classArr.concat(attrs.classList.filter(Boolean));
      } else {
        elem[attr] = attrs[attr];
      }
    }
  } else if (typeof attrs === 'string' || typeof attrs === 'number') {
    elem.textContent = String(attrs);
  }
&nbsp;
  if (classArr.length) elem.classList.add(...classArr);
&nbsp;
  if (children) {
    children.forEach(child =&gt; {
      if (!child) return;
&nbsp;
      if (child instanceof HTMLElement) elem.appendChild(child<span class="branch-0 cbranch-no" title="branch not covered" >);</span>
<span class="cstat-no" title="statement not covered" >      else console.error(child, 'not instance of HTMLElement');</span>
    });
  }
&nbsp;
  return elem;
}
&nbsp;</pre></td></tr></table></pre>

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